Account
Inquiry
A 400-amp surge for five seconds from a battery this size is what usually catches people off guard, but the real workhorse spec is the 40Ah at the 20-hour rate pulling 2.1 amps down to 10.8 volts — that's where you get consistent runtime for telecom gear or power equiment that can't tolerate voltage sag under sustained load.
What it basically means is you're looking at a deep-cycle AGM with lead-calcium plates, so self-discharge stays under 3% per month at 20°C and you can float-charge it at 13.6 to 13.8V for years without cooking the electrolyte — we've seen these sit in backup cabinets for 8 years or so before capacty drops noticeably.
Cycle life is rated at 500 cycles at 50% depth of discharge, but if you run it shallower — say 20% DOD — you'll easily double that number; just don't push cycle voltage above 14.7V at 25°C or you'll vent the valve prematurely and lose water.
We usually stock the PTD40-12 with T12 lead bolt terminals standard, but if your bus bars need a different stud pattern or you want M6 inserts instead, give us the drawing and we'll adjust the insert molding during the ABS case assembly — the tooling takes about 20 days or so for a custom run.
One thing that's not obvious from the datasheet is the plate thickness — it's roughly 2.2mm per positive plate, which is thicker than most generic 40Ah units, so you get better corrosion resistance in float service and less shedding when you cycle it hard at 40°C ambient.
Not suited for high-rate pulse loads like a starter motor or inverter startup that demands 600A plus — AGM separator will handle 400A bursts fine, but sustained high current above 50A will heat the internal resistnce and shorten cycle life noticeably.
Our standard MOQ is 100 units per model, but we can discuss smaller trial orders if you're just getting started. Just let us know your volume.
For a standard custom order, lead time is usually 20-30 days after sample approval, depending on quantity and customization level. We'll confirm the exact timeline once we have your specs.
Yes, all three certifications — CE, ISO, and SGS — are available for this model. We’ll share copies with your order confirmation or upon request.
For continuous float charging at 25°C, keep it between 13.6V and 13.8V. This ensures the battery stays topped up without overcharging, extending its 5-8 year design life.
Store it in a cool, dry place between -20°C and 50°C. Since it self-discharges only about 3% per month at 20°C, you can leave it up to 6 months before a refresh charge is needed.
